ADM6820ARJZ-REEL7

Overview

The ADM6820ARJZ-REEL7 is a voltage sequencer and supervisory circuit manufactured by Analog Devices Inc., housed in a SOT-23-6 surface-mount package. It operates within a supply voltage range of 900 mV to 5.5 V, with a typical quiescent current of 350 uA. The device monitors two inputs, featuring an adjustable overvoltage threshold set via the VSET pin and a fixed undervoltage threshold of 2.525 V. It includes an internal charge pump for N-FET drive capability and offers an adjustable reset delay time of 300 ms, controlled by an external capacitor on the SETD pin. The component functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrates an internal charge pump to fully enhance external N-channel MOSFETs for secondary power rails.
• Features an adjustable main power monitor threshold via the VSET pin, capable of monitoring voltages as low as 0.62 V.
• Provides a capacitor-adjustable delay timer between main power normal and secondary power enable states.

Applications

• Multi-voltage system power sequencing
• Dual voltage microprocessor, FPGA, ASIC, or DSP initialization
• Telecommunications and data communication systems
• Personal computer and server power management

Procurement Notes

Verify the specific suffix REEL7 confirms tape-and-reel packaging when sourcing. Confirm the manufacturer part number matches exactly to ensure correct threshold and delay characteristics. Check RoHS compliance status through official documentation. Validate that the SOT-23-6 footprint aligns with PCB design requirements. Ensure availability from authorized distributors given potential supply constraints.

Selection Notes

Select this component when a simple, low-pin-count solution is required for sequencing two power rails. It is suitable for applications needing adjustable delay timing without complex digital interfaces. Consider the 350 uA quiescent current for battery-sensitive designs. Verify that the adjustable threshold range meets the specific main rail monitoring needs. Ensure the SOT-23-6 package size fits the spatial constraints of the assembly.

Part Context

This device belongs to the ADM6819/ADM6820 series of simple power sequencers. While the ADM6819 features a fixed 200 ms delay and an additional EN pin for secondary monitoring, the ADM6820 simplifies the design by offering an adjustable delay via a single external capacitor. Both share similar FET drive capabilities and package options, allowing for flexible design scaling based on complexity requirements.

Replacement Considerations

Public confirmed substitute part numbers include ADM6819ARJZ-REEL7. Note that the ADM6819 has a fixed 200 ms delay and includes an Enable pin, differing from the ADM6820's adjustable delay architecture. Cross-reference datasheets to ensure functional compatibility regarding FET drive strength and threshold settings.